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Geenen AUGUSTUS KEENEfOF NE'WBURYPORT, MASSACHUSETTS. 'Leners Patent N5. 65,1154, dated June 11, 1857.4

IMPROVEMENT IN INDIA-RUBBBRTREAD FOR CARRIAGE STER "Qtlgt rlgemletstmh tu in tlpsr Enters r'mt annimmt tige same.

TO Li'WHOM/I'l MAYCONCERN: 4 l

' Be it known that 1,' GEORGE AUGUSTUS KEENE, of Newburyport, inthe county of Essex, and State' of Massachusetts, have invented a new and useful improved Trend for Carriage Steps; and I do hereby declare ythat, the following is a full, clear, and exact description of the construction and operation of the same. refer-Y ence being had to the accompanying drawing forming a partof this specification, sufici'ent to enable others skilled in .the art to construct my improvement without other invention or experiment.

To avoidy and obviate tbe cofnmo'n difficulty and danger of entering and leaving carriages in rainy? snowy,

or diity weather, have invented a tread for carriage'step's ivhich forms the subject of this application.

Myinve'ntion, then, vconsists inthe application to the tread of la carriage step by' appropriate and permanent 'means of rubber formed into cells bj reticnlated ridges. Various ways may be conceived in 'which this may' be v done. The sheet .of prepared rubber may be cemented directljto the ordinary step, or it may be fastened to a suitable arrangement of straps, and strapped to the ordinary step, or it may bc affixed in the following manner,

. which conceive to belby' far the best: I attach'to a pletefof iron or other metal, shaped as may be desired,

either round,vsquare, or oval, or of any convenient form, a quantity of rubber stock, and'compress tbe rubber into a mould of such form as to give an intaglioof separate cells to the'rubber., and vulcanize thc whole; this will give a plate of the plan shown Figure 1,- andV the section sbonnFigure 2. '.lhe cells may be perforated at the bottom, and the'plate beneath perforated to allow of the escape of dust.

' In the figures, a are thc cells ofthe rubber tread, b andc are the reticulated ridges forming the cells, ci' are .the cells with perforated bottoms to-allow the escape of dirt, f is the plate on which the tread is vulcanized, g' is the ordinarystep of the carriage, and e are the rivets fastening the trend to the step, which Iconsider the best form of attachment. l,

Iclaim aslrny invention, and desire to secure by Letters Patent- Y v l YThe arrangement and combination of the Vplate f, in connection with and securely fastened to the rubber tread, consisting of reticulated ridges bland c, and intagliocelle a' and cl to form a tread fot` a carriage step, substantiallyA as described. l 4 GEO. A. KEENE.

Witnesses:

Tnos. WM. CLARKE,- `Ones. .HEMEL/IAN. 

